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Seven tons of aluminum wall studs fell 13 stories from a high-rise construction site in Battery Park City yesterday, seriously injuring a man inside a trailer that took the brunt of the hit.

Robert Wood, an architectural consultant, was in critical but stable condition at St. Vincent’s Hospital last night.

The studs, in a nylon sling, were being hoisted by a crane up the future Goldman Sachs tower at Murray and West streets at 10:50 a.m. when the sling snapped, city officials said.

Eric Latson, who was working on the seventh floor of a nearby building, said he heard a boom.

“When I looked out, I saw debris all over the trailer and people were running from all directions to the spot,” he said.

The impact smashed the trailer in two, and rescuers rushed to get Wood out.

An FDNY spokesman called Wood’s injuries “serious.”

“He was talking when he left the scene,” James Booth said.

Work on the site was immediately halted as the city Buildings Department investigated.

By mid-afternoon, inspectors had issued four violations to the contractor, Tishman Construction, including charges of unsafe hoisting operations and failing to safeguard the public. The city issued two other violations for safety issues that Tishman said were unrelated.

The crane company, DCM Erectors Inc., was also issued a violation for unsafe hoisting operations. The crane was on the building’s 30th floor.

City officials have issued several other safety violations to the project since work on the 43-story tower began last year, including one for an incident in which a pedestrian was struck by a hammer. That case was resolved without any fine.

“Our safety record on this project, in general, is excellent by industry standards,” Tishman said in a statement.